Facebook Lite is still available in specific regions like Turkey or parts of Asia. You can try changing your Apple ID region to one of these countries to download the official app from the App Store . :
Facebook Lite was developed for the to address low-RAM devices, slow processors, and 2G/3G networks. On iOS, Facebook develops a single native application optimized for the device's hardware. Apple does not permit "Lite" versions of apps that duplicate core functionality of an existing official app. Facebook Lite Ipa Download Fixed